Maybe you can email mare_in_flames about it. She's the best.
Re swayback--maybe his topline needs to be built up like I'm doing with Boo. Ask your vet or someone at your barn about exercises. I'm currently long-lining Boo in a Pessoa (not everyone agrees with the Pessoa, though) and doing lot of hill work with her. Maybe just leading him up and down a hill every day for 20 minutes could help.
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Re swayback--maybe his topline needs to be built up like I'm doing with Boo. Ask your vet or someone at your barn about exercises. I'm currently long-lining Boo in a Pessoa (not everyone agrees with the Pessoa, though) and doing lot of hill work with her. Maybe just leading him up and down a hill every day for 20 minutes could help.